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- ArticleSpringer TA, Kaufman JF, Siddoway LA, Mann DL, Strominger JL.J Biol Chem. 1977 Sep 10;252(17):6201-7.The HLA-linked B cell alloantigen (p29,34) is composed of two subunits of 29,000 (p29) and 34,000 (p34) molecular weight. The partially purified HLA-linked B cell alloantigen was purified by a final step of preparative sodium dodecyl sulfate-gel electrophoresis. An antiserum was prepared against p29,34 which specifically lysed B lymphocytes. In sodium dodecyl sulfate at 21 degrees, p29 and p34 remained noncovalently associated and retained immunologic activity; subunit dissociation at higher temperatures correlated with loss of immunologic activity. Although the pI values of p29 and p34 are 6.1 and 5.2, respectively, the subunits co-electrofocus under nondenaturing conditions. In addition, cross-linking studies showed the B cell antigen has a (p29)1(p34)1 subunit structure.